Trying to understand?

Hi. I recently met my now ex partner on a dating site, we met up and the realtionship went really well, he told me he had austism which didnt bother me, it made him him! Yesterday I received a text message telling me he didnt want the relationship, i thought fine,  after 6 months i want an explation, we met up & he explained that he is still in love with me but the austism is stopping his ability to be in a relationship, we have agreed  stay friends however I need to understand? I'm hoping someone can shed some light on this situation for me? 

Thanks T